I'm using a POD HD desktop with a Line 6 Spider Valve 112. When my POD HD is connected to my laptop via usb and connected to the amp it sounds horrible. There is a very loud hum and the tone is somewhat distorted as well making it completely unplayable. I have the POD HD connected to the POWER IN jack on the back of the amp and I also tried plugging it into the regular guitar in jack which makes it way worse. The POD sounds find when not connected to the computer but the second the USB cable goes anywhere near my computers usb port the humming starts. I've tried plugging the pod and computer, into a different outlets, different instrument and usb cables but they have no effect. Any ideas on what might be causing the problem?
